Idleup Device

The pump produces the maximum fluid pressure when the steering wheel is turned fully to the right or left and, at this time, there is a maximum load on the pump which causes a decrease in engine idle rpm. To solve this problem, vehicles are equipped with an idle-up device which acts to raise the engine idle rpm whenever there is a heavy load on the pump.

On EFI engines, when the piston of the air control valve is pushed by fluid pressure, the air valve opens and the volume of air by-passing the throttle valve is increased to regulate engine rpm.

Valve

Hydraulic

Reaction

Chamber

Valve

Hydraulic

Reaction

Chamber

Vehicle Speed Sensor

Power Steering ECU

Housing

Vehicle Speed Sensor

Power Steering ECU

Housing s«?694

Surge Tank

Stecrir>g Gear Housing

Valve

Surge Tank

Stecrir>g Gear Housing

Valve

The idle-up device functions to raise engine idle rpm when pump fluid pressure acts on the air control valve, installed to the pump body, to control the flow of air.

Nipporvdenso

Nipporvdenso

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Borroughs

Borroughs ccoooi

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